PM7344 S/UNI-MPH
DATA SHEET
PMC-950449
ISSUE 6
MULTI-PHY USER NETWORK INTERFACE
Registers 059H, 159H, 259H and 359H: XPDE Interrupt Enable/Status
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R/W
R/W
R
R
R
R
R/W
R/W
STUFE
STUFF
STUFI
PDV
Z16DI
PDVI
0
0
0
0
0
0
0
0
Z16DE
PDVE
These registers are used to enforce a minimum pulse density in the transmit
stream when the T1 format is enabled.
STUFE:
The STUFE bit enables the occurrence of pulse stuffing to generate an
interrupt on INTB. When STUFE is set to logic 1, an interrupt is generated on
the occurrence of a bit stuff. When STUFE is a logic 0, bit stuffing
occurrences do not generate an interrupt on INTB.
STUFF:
The STUFF bit enables pulse stuffing to occur upon detection of a violation of
the pulse density rule. Bit stuffing is performed in such a way that the
resulting data stream no longer violates the pulse density rule. When STUFF
is set to logic 1, bit stuffing is enabled and the STUFI bit indicates the
occurrence of bit stuffs. When STUFF is a logic 0, bit stuffing is disabled and
the PDVI bit indicates an occurance of a pulse density violation. Also, when
STUFF is a logic 0, transmit data passes through XPDE unaltered.
STUFI:
The STUFI bit is valid when pulse stuffing is active. This bit indicates when a
bit stuff occurred to eliminate a pulse density violation. When pulse stuffing is
active, PDVI remains logic 0, indicating that the stuffing has removed the
density violation. The STUFI bit is reset to logic 0 once this register is read.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
170
PMC [ PMC-SIERRA, INC ]
